General
Number of serial ports	16
Ethernet connection	RJ45
Redundant COM function
Dual-host function
Dual-LAN

The Moxa CN2650-16 is an industrial terminal server with 16 serial ports, designed for use in demanding environments such as automation, power supply, transport, and building infrastructure. The device connects serial devices via RS-232/422/485 interfaces to modern Ethernet networks, enabling the integration of legacy fieldbus systems into IP-based networks. With two Ethernet interfaces and optionally two AC power inputs, it provides comprehensive redundancy for network and power supply, increasing fault tolerance. The Redundant COM function ensures that when Dual-LAN is active, each data packet is transmitted simultaneously over both networks. If one connection fails, communication continues over the second connection. Additionally, the Dual-Host function supports the integration of a backup PC, which automatically takes over in case of primary system failure.

Applications

The CN2650-16 is suitable for applications requiring high availability and reliability of communication. Typical use cases include industrial automation systems, power supply networks, traffic control systems, and building automation. Support for multiple operating systems and serial protocols, along with compatibility with standard MIBs, SNMPv3, HTTPS, and RADIUS, makes the device a flexible bridge between serial fieldbus and modern networks.

Functions and Features in Detail

The device features 16 serial ports that can operate as RS-232, RS-422, or RS-485. The operating modes include Real COM, TCP Server/Client, UDP, RFC2217, Terminal, PPP, Reverse Telnet, DRDAS, and Redundant COM. The baud rate can be set between 50 bps and 921.6 kbps, with data, stop, and parity bits configurable flexibly. Flow control is achieved via RTS/CTS, DTR/DSR, or XON/XOFF. For RS-485 applications, additional functions such as ADDC®, Pull-Up/Down resistors, and Terminator are available.

Technology Explained Simply

The two Ethernet interfaces (10/100BaseT(X), RJ45) are equipped with 1.5 kV isolation, protecting them against transient voltage spikes. The Dual-LAN function allows the use of two independent network connections, each with its own MAC/IP address. The Redundant COM function ensures double data transmission to maintain communication in case of network or host failure. The Dual-Host function allows configuration of a backup host that automatically takes over in case of failure. The security functions include authentication via local database or RADIUS, encryption via HTTPS, AES, RSA, and SHA, as well as support for SNMPv3, SSHv2, and MIB-II. Configuration is performed via Web-GUI (HTTPS), Telnet, console, Windows Utility, or DSU.

Compatibility and Accessories

The terminal server supports a wide range of operating systems, including Windows 95 to 10, Server up to 2019, Linux (kernel 2.4–5.x), UNIX (SCO, QNX, Solaris, AIX, HP-UX), macOS, and Android API from 3.1. The driver environment includes Real COM, TTY (Linux), and fixed TTY (UNIX). Serial protocols RS-232, RS-422, and RS-485 are fully supported. The accessory compatibility includes RJ45-DB9 cable, network cable, and rack mounting kit, all included in the delivery scope.

Mounting and Installation

The device is housed in a metallic 48,3 cm ( 19 inch ) rack enclosure and can be mounted directly into standard racks. Dimensions are 440/480 x 198 x 45.5 mm, with weight ranging from 2.41 to 4.42 kg depending on the model. Mounting is done using the included rack mounting kit. Installation is guided by the provided quick start guide, which explains configuration via Web-GUI, Telnet, or console.

Operational Advantages

The CN2650-16 offers high operational reliability through redundancy functions for network and power supply. The MTBF (Mean Time Between Failures) is up to 831,925 hours (e.g., CN2610-8), with high-temperature models having at least 115,887 hours. The environmental conditions include standard operation from 0 to 55 °C, with -T models operable from -40 to 85 °C. Humidity is 5–95 %, non-condensing. Certifications include EMC (EN 55032/24 or 55032/35), EMI (CISPR 32, FCC Part 15B), EMS (IEC 61000-4-2 to -4-11), Safety (UL 60950-1 or UL 62368-1), as well as environmental standards (RoHS, CRoHS, WEEE). The protection rating is not explicitly stated, but the device is designed for industrial environments, indicating high mechanical and electrical robustness.

Delivery Contents

The device is delivered with the following components: 1x CN2600 device, 1x RJ45-DB9 cable, 1x or 2x network cable, 1x rack mounting kit, 1x quick start guide, and 1x warranty card.